Armstrong Midlength Mk II X-Form Foilboard

Armstrong Midlength Mk II X-Form Foilboard

The Midlength Mk Il marks the next step forward in Armstrong's board design, debuting our all-new molded board technology. Built to deliver a lighter, stronger, and more connected ride, it represents a major leap in durability, response, and long-term performance.

Refined through years of testing in New Zealand's most demanding conditions, the Midlength Mk Il blends Armstrong's signature feel with a new level of control and consistency. It's designed not just to perform, but to keep performing session after session.

Built around Armstrong's new X-Form Precision Molded Board Technology, the Midlength Mk II delivers an uncompromising strength-to-weight ratio with precision-tuned performance. Stronger, stiffer, and more durable than traditional constructions, it maintains the connected feel Armstrong boards are known for while eliminating softening and fatigue over time.

On the water, the Midlength Mk II feels composed, responsive, and predictable. The thinner X-Form profile delivers a more direct connection to the foil while the refined bottom design reduces sticking and tracking for cleaner touchdowns and faster recovery. Combined with a surf-style squash tail, Forward Geometry foil track, integrated carbon foil tracks, dual carbon stringer system, and redesigned deck grip, the Midlength Mk II delivers greater control, confidence, and progression across all foiling disciplines.

What exactly is X-Form?

X-Form is Armstrong's precision molded board technology and manufacturing process. Developed using proprietary CNC-machined molds, precision-engineered internal components, and advanced composite construction, every X-Form board is formed in a single molding cycle under uniform pressure and temperature. The process permanently locks in the board's rocker lines, rails, bevels, and contours while ensuring every internal component is aligned to exact tolerances. Drawing on Armstrong's experience designing and manufacturing high-precision molded foils, X-Form brings the same level of manufacturing accuracy and consistency to board construction.

X-Form Features:

• Foil Assist Compatible Window - Foil Assist compatible window for clean, uninterrupted remote signal.
• Double Sandwich Foot Area - Complete PVC wrap of deck and underside of board with extra reinforced foot panels which are doubled up with another layer of high density PVC to handle the heaviest of landings.
• High Density PVC Wrap - Entire internal surface of board wrapped in high density PVC. Even if it does crack it won't absorb water like EPS foam would.
• High Density PVC Rails - High density PVC foam wrap of the whole perimeter of board. Protects the areas of the board most at risk to damage.
• Ultralight Large Sphere EPS Core - The high-pressure molded layup is super stiff and the ultralight EPS core absorbs shocks for a solid and smooth ride.
• Dual Carbon Stringer System - Armstrong's reputed I-beam top-to-bottom dual carbon stringers provide maximum structural rigidity and durability by fully connecting the deck and bottom of the board.
• Carbon Foil Tracks - Proprietary carbon fiber foil tracks are keyed directly into the stringer fibers along with carbon fiber for a fully integrated and ultra-strong construction where it counts most.

Shape & Outline

Balanced, Responsive, Predictable.
On the water, the Midlength Mk II feels composed, responsive, and predictable. The improved stiffness profile creates a clean, connected sensation underfoot, allowing riders to feel exactly what the foil is doing. The result is more confidence at speed, better control in critical moments, and a smoother, more intuitive riding experience across disciplines.

Refined Profile
Thanks to the new X-Form construction the refined profile features a considerably thinner board, delivering a more direct connection to the foil and reducing unwanted touch-downs.

Optimized volume distribution
Optimized volume distribution maintains stability and balance while allowing the board to sit lower to the water, creating a cleaner, more responsive feel underfoot. The result is a thinner, more connected board that enhances control, feedback, and confidence across all conditions.

Reduced Sticking & Tracking
The new bottom design is shaped to optimize fluid dynamics at every phase of flight. A refined double concave transitioning to a subtle V helps generate early lift, making take-offs easier and more efficient while smoothing touch-downs. When the board reconnects with the water, it glances off the surface rather than sticking or tracking, allowing for quick, clean release back onto foil. Shallower chines and a flatter bottom through the rear further reduce drag and resistance, creating a fast, predictable feel that supports take-offs and landings.

Surf Style Squash Tail
The surf-style squashed tail adds stability when getting onto the board, making early positioning and balance more intuitive. By allowing the rails to remain more parallel for longer, the shape increases surface efficiency and helps generate speed quickly, improving take-off performance. The result is a tail design that feels stable underfoot while delivering faster, more confident launches onto foil.

Forward Geometry Foil Track
Armstrong's Forward Geometry concept, introduced in 2021, redefined foilboard design by placing the foil more centrally to reduce swing weight and increase responsiveness while remaining compatible with any foil system. The Midlength Mk II continues this legacy with FG foil tracks positioned further forward for enhanced maneuverability and a more connected feel on foil across all board sizes.

Sizes:

• 38L – 4'8" x 18 1/8" x 3 1/4"
• 45L – 5'0" x 18 5/8" x 3 1/2"
• 55L – 5'4" x 19 1/8" x 4"
• 65L – 5'8" x 19 5/8" x 4 1/4"
• 75L – 6'0" x 20 3/8" x 4 3/8"
• 85L – 6'4" x 21 3/8" x 4 1/2"
• 100L – 6'8" x 22 1/4" x 4 7/8"
• 115L – 6'11" x 22 3/4" x 5 1/4"
• 130L – 7'2" x 23 1/4" x 5 ⅝”

Includes: Board, Premium Board Bag